Underfeed stoker



1,691,949 s. .5. A. WIEBE UNDERFEED STOKER Filed. March 5, 1925 3 sheets-Sheet 2 }N.v. m M. 8m m //I O TW N N$ ENWLA. W $5 mm m 5 A Nov. 20, 1928.

Nov; 20, 1928.

S. J. A. WIEBE UNDERFEED STOKER Filed March 1925 5 Sheets-Sheer. 3

INVENTOR 5. 1/]. W/ebe,

A TTORNEK? Patented Nov. 20, 1928.

UNITED, STATES 1,691,949 PATENT OFFICE.

. emon!) 3'. A. WIEBE, 011* EAST ORANGE, NEw JEEsEY, ASSIGNOR 'Io INTERNATIONAL coIrBUs'rIoN ENGINEERING coEroEATIoN, NEW YORK, N. *Y., A coEronA'rIoN OF DELAWARE.

UNDERFEED STOKEB.

Application flled'flarch 3, 192 51 Serial No. 12,814.

My invention relates to underfeed stokers and has special reference to multiple retort underfeed stokers which are provided with I a plurality of retorts' arranged side by side .6 and spaced apart with tuyere structures spanning the margins of the adjacent side walls of adjacent retorts. The fuel is delivered into the forward end of each retort from a hopper by means of a reciprocating pusher associa d with each retort. In some multiple retort underfeed stokers in common commercial use, thelon tudinal side walls of the retorts'and t e tuyere structures supported thereon are longitudinally movable so as to feed thefuel as it is being burned toward the ash pit of the furnace, while in others the retort side walls are stationary and a longitudinal reciprocable ram or pusher is associated with each retort for accomplishing that result. In either case, this secondary fuel feeding mechanism or pusher for feeding the fuel within the furnace, isusuallyactuated through a lost .motion connection with the I 26 primary pusher associated with the retort.

An object of the present invention is to provide a novel and improved lost motion connection of the character indicated.

Another object of the invention is to provide a 10st motion connection of this character which is adapted to be easily adjusted during the operation of the stoker to vary the extent of the movements of the secondary pusher as desired to meet difierent condi- 85 tions.

, Another object of the invention is to provide a novel and improved mechanism for an underfeed Stoker.

The several features of the invention,

- 4e whereby the above-mentioned and other objects may be attained, will be clearly understood from the following description and accompanying drawings, in which:

Figure 1 is a longitudinal sectional view, partly diagrammatical, embodying the features of the invention in their preferred form;

Fig. 2 is a side elevation on an enlarged scale of the fuel hopper and a portion of the fuel feeding mechanism shown in Fig. 1, the usual extension of the hopper shoWn in Fig. 1 being omitted; and v Fig. 3 a sectional v1ew taken on the line 22, of .Fi 2

6 The stoker illustratedv in Fig.-

fuel

1 on the drawings is provided with an ash pit 1 at the rear thereof, a downwardly'and rearwardly inclined retort 2, a fuel hop er 3 associated with the forward end of the retort, a primary pusher 4 for feeding fuel 60 from the hopper into the retort, and a secondary'ram or pusher 5 mounted to slide in the retort to feed the fuel therein toward the rear end of the furnace. The primary pusher 4 is reciprocated by means of a crank 6 and a connecting rod 7 having its rear end pivoted on a pin Sextending transversely through the pusher. The secondary ram or pusher 5 is reciprocated by means of a link 10 having one'end connected with a ing its other end connected with the rear end of a rod 14L mounted to slide horizontally 111 hearings in depending lugs 16 on the under side of the hopper casing.

The parts above referred to are of a well known construction. I

In the illustrated construction, a lost so motion connection of novel and improved construction is provided between the primary pusher and the sliding rod 14 for actuating the latter and, thus, through the link 10 actuatin the secondary pusher 5. As shown, t is lost motion connection comprises an upstanding yoke 18 which straddles the primary pusher casing and has its upper end provided with slots or apertures 20 for receiving the projecting ends ofthe transverse pin 8, the sides of the pusher casing being provided with elongated clearance slots 22 through which the ends of'the pin 8 extend. The upper endsof the yoke 18 are secured to the'ends of the pins by means of set screws 24. The yoke 18 is formed on a carrier 26 which is mounted to slide longitudinally on a stationary rod 28 which extends centrally beneath the pusher and hopper casing, and has its forward end 1m secured in an aperture in the forward lug 16 and its rear end secured in an aperture in a lug 30 depending from the under side of the ram casing.

The sliding carrier 26 is provided with a 101 depending lug 32 which has its lower portion bifurcated so as to straddle the reciprocable rod 14:. The front side of this lug '32 forms an abutment face, which, during the latter part of the forward or retracting 11 pivoted abutment p and its upper portion is adapted to work over a movement 'of the primary fuel pusher 4, engages a collar 34 secured on the sliding rod 14-, and thus effects the forward movement of the rod and secondary pusher. An abutment member 36 is pivotally mounted at one end on studs or pins 38 projecting from opposite'sides of the ug 32 and extending through apertures in the longitudinal sides of the abutment member, the abutment 'member being made in two sections arranged at opposite sides "of the lug 32 and be1n secured together by bolts 40 extending t rough ears 42. The rear or upper side of the two sections of the abutment member 36 is provided with a series of abutment faces 44 which are spaced different distances from the axis of the abutment member, arately presented, by turning the abutment member on its 46 on the forwardly pro'ectin end of a collar 48 which is secured y b0 ts 50 to the sliding rod 14. v

The abutment collars 34 and 48 are suitably positioned so that during the latter part of the forward movementof the primary pusher 4 and the carrier 26, the forward face of the abutment lu ment collar 34 an carr the sli ing rod 14 therewith; and during t e later part of the rearward movement of the pusher and sliding carrier 26 one of the abutment faces 44 on the pivoted abutment 36 will en age the abutment collar 48 and move the slidingrod 14 therewith.

It will be apparent that the limit of the rearward movement of the sliding rod 14 and hence the secondar usher 5, will depend uponxwhich one o t e abutment faces 44 en ages the abutment collar 48, so that b a justing the angular position of the abutment member 36 the varied as desired. To provide for such adjustment of the pivoted abutment 36, a chain 52 has one end secured to a pin 54 on the 36 and its other end connected with one end of a bolt 56, the chain passing over an idle pulley 58 mounted on the carrier 26. The bolt 56extends through a barrel 60, and a spring 62 is coiled about the bolt and interposed between the outer end of the barrel and nuts 64 secured'on the outer end of the bolt. The barrel 60 is pivotally mounted on the lower end of a handoperated lever 66, the barrel being provided with a laterally extending pivot pin 68 which extends through an aperture in the lower end of the lever and is held thereon by a cotter pin 70. The lever 66 is pivotally mounted on a pin 72 secured to the sliding carrier 26,

a quadrant 74 on the upper end of one of the arms of the yoke 18 of the sliding car- Her.

The upper portion of the lever 66 is and are adapted to be sep-' pivot, to the abutment face 1 with the abutment 32 will engage the abutmade in two sections which are pivotally connected by a pin 76 spaced a distance above the pivot pin 72, and the'uppersection of the lever 1s pressed toward the quadrant 74'by means 0 a leaf spring 78 having one end secured to the upper section a, dis- -tance'above the pivot 76, and its free end bearing upon' the lever at a point spaced a distance below the pivot 7 6, the intermediate portion of the spring bearing under tension upon a rounded shoulder 80 formed on the upper end of vthe lower section of the lever. T e inner face of the lever is a; lug 82 which is adapted to received in any one of a series of notches 84 in the quad-' rant, the notches corresponding in numberto the number of abutment faces on the pivoted abutment 36. With this construction when it is desired to vary the length of the stroke of the sliding rod 14, the hand operated lever 66 is moved to position its holding lug 82 in the notch 84 of the quadrant corresponding to the abutment face which it is desired to bring into position to engage the abutment collar 48. In case the lever 66 is thus shifted when the pivoted abutment is in engagement collar 48 and hence is held thereby, the lever when moved in a clockwise direction viewing'Fig. 1 will act to tension the coiled spring 62 and when the ment with the abutment collar 48, the spring rovided with will act through its bolt 56 and chain 52 to lift the pivoted abutment to the desired adjusted position. When the lever 66 is turned in the opposite direction, the chain 52 will be slackened so that upon disengagement of the pivoted abutment from the abutment collar 48 the pivoted abutment may drop by gravity to its desired adjusted position.

From the foreg ing it will be apparent that the operator b merely adjusting the position or the ban -operated lever 66 over the ciuadrant 74 may present any one of the a utment faces 44 to the abutment collar 48, and that the engagement of the lu 82 on the lever with the walls of the notch 84 in which it is received, will firmly hold the pivoted abutment in its adjusted position.

As will be evident to those skilled in the art, my invention permits various modifications without departing from the spirit thereof or the scope of the appended claims.

What I claim is: v

1. An underfeed stoker havin in combination, a fuel ho per, a reciproca le primary pusher for fee ing fuel into the furnace from said hopper, a reciprocable secondary pusher for feeding the fuel within the fur nace in a direction away from said hopper, a reciprocable member, suitable connections between said secondary pusher and said reciprocable member for operating the secondary pusher, and a lost motion connection between the primary pusher and said reciprocable member for actuating the latter,

. comprising a sliding carrier mounted to comprising a controllable member and suitable connections mounted on said carrier for thus turning said pivoted abutment and holding it in the position to which it is moved.

2. An uhderfeed stoker having, in combination, a fuel hopper, a reciprocable primary usher for feeding fuel into the furnace rom said hopper, a reciprocable secondary pusher for feeding the fuel within the furnace in a direction away from said hopper, a reciprocable member, suitable the secondary pusher, and a lost motion connection between the primary pusher and said reciprocable member for actuating the latter, comprising a sliding carrier mounted to move with the primary pusher, cooperating abutments on the carrier and reciprocating member formoving the latter in one direction during the movement of the primary pusher in the same direction, the abutment on the carrier being pivotally mounted and provided with a plurality of abutment faces spaced different distances from the axis of t e pivoted abutment, and arranged to permit any one of them'tobe presented to the abutment on the reciprocating member upon turning the pivoted abutment, and means for thus adjusting said pivoted abutment comprising a flexible member having one end connected with the pivoted abutment, a

hand operable controlling lever mounted on the carrier, and means comprising a spring, connecting said lever with the other end of said flexible member.

In testimony whereof, I have signed my name to this specification this 20th day of February, 1925.

connections between said secondary pusher and said reciprocable member for operating SIGURD J. A. WIEBE. 

